At the risk of oversimplification there seem to be five main currents that make up the art music of the twentieth century. (1) Musical style that rely on the national or regional idioms. (3)The incorporation of new developments into musical styles rooted in the past. (3) A reaction to the post-Wagnerian romantic idiom that attempted to transform it.(4) A return to audience pleasing music fashioned from earlier styles.(5) A radical attempt at rejection of the Romantic Past and its aesthetic, None of these is a discrete school of thought and expression, and there are countless cross-currents. Many composers found two or more of these courses attractive and treated them in their own personal, Often highly idiosyncratic way. Cutting across all of them is a tendency to twist conventional musical forms, structures, and values and turn them toward new ends.